Multi-Platform Shopping App Development

I am in need of an experienced app developer who can create a shopping app for both iOS and Android. The main target audience will be general consumers.

Key Features Needed:
- User friendly interface
- Secure payment gateway
- Smooth navigation
- Well-organized product categories

Ideal Skills and Experiences:
- Proven experience in developing shopping apps
- Strong proficiency in both iOS and Android development
- Familiarity with design software and UX/UI for a smooth and responsive app
- Understanding of secure payment gateway integration

If this sounds like you, please bid with examples of your previous work in app development, particularly shopping apps.